diff --git a/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs b/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
index 6b9306f..1b6c470 100644
--- a/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
+++ b/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
@@ -584,7 +584,9 @@ public class DefaultForwardFlow : IForwardFlow, ITransientDependency
                 GlobalConst.DateTime => TurnDate(now, description),
                 GlobalConst.Url => context.TargetInterface.RequestAddress,
                 GlobalConst.FromAccount => context.GetAccountFieldValueOrNull(name) ?? string.Empty,
-                GlobalConst.FromMappingBody => GlobalConst.FromMappingBody,
+                GlobalConst.FromMappingBody => context.TargetInterface.ContentType == ContentType.FormUrlEncoded
+                    ? GlobalConst.FromMappingBody
+                    : JsonConvert.SerializeObject(context.OriginalInterfaceMappedInput),
                 _ => value
             };
         }
diff --git a/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs b/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
index bd72c22..637bd28 100644
--- a/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
+++ b/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
@@ -367,8 +367,8 @@ public class InterfaceService : ApplicationService
         switch (input.ContentType)
         {
             case ContentType.None:
-                if (input.InParameterList.Count > 0 || input.RequestBodyParameterList.Count > 0 || input.MappingBodyParameterList.Count > 0 || input.BodyFormParameterList.Count > 0)
-                    throw new BusinessException(message: "None 下游接口只能维护 Query/Header/Response");
+                if (input.InParameterList.Count > 0 || input.RequestBodyParameterList.Count > 0 || input.BodyFormParameterList.Count > 0)
+                    throw new BusinessException(message: "None 下游接口只能维护 Query/Header/MappingBody/Response");
                 break;
             case ContentType.Json:
             case ContentType.Xml:
@@ -397,6 +397,8 @@ public class InterfaceService : ApplicationService
         switch (input.ContentType)
         {
             case ContentType.None:
+                await ParameterService.CreateParametersAsync(input.MappingBodyParameterList, interfaceId, true,
+                    ParameterParaKind.MappingBody);
                 break;
             case ContentType.Json:
             case ContentType.Xml:
@@ -420,6 +422,8 @@ public class InterfaceService : ApplicationService
         switch (input.ContentType)
         {
             case ContentType.None:
+                await ParameterService.MaintainParametersAsync(input.MappingBodyParameterList, interfaceId, true,
+                    ParameterParaKind.MappingBody);
                 break;
             case ContentType.Json:
             case ContentType.Xml:
diff --git a/src/InterfaceForward.Repositories/InterfaceForwardQuery.cs b/src/InterfaceForward.Repositories/InterfaceForwardQuery.cs
index 9eedfa4..4919618 100644
--- a/src/InterfaceForward.Repositories/InterfaceForwardQuery.cs
+++ b/src/InterfaceForward.Repositories/InterfaceForwardQuery.cs
@@ -217,12 +217,10 @@ ORDER BY `b`.`Sort` ASC").ToListAsync();
         foreach (var map in maps)
         {
             var targetInterface = targetInterfaceList.First(x => map.DownStreamCode == x.Code);
-            var paraKind = targetInterface.ContentType == ContentType.FormUrlEncoded
+            var paraKind = targetInterface.ContentType is ContentType.FormUrlEncoded or ContentType.None
                 ? ParameterParaKind.MappingBody
                 : ParameterParaKind.Normal;
-            var inParaMaps = targetInterface.ContentType == ContentType.None
-                ? []
-                : await GetParameterMapListAsync([map.Id], true, paraKind);
+            var inParaMaps = await GetParameterMapListAsync([map.Id], true, paraKind);
             var items = inParaMaps.Where(x => x.InterfaceId == targetInterface.Id).ToList();
             var fixedFieldList = await GetAllFixedFieldListAsync(serviceProvider.Id, targetInterface.Id);
 
diff --git a/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs b/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
index 6f193c7..1781af9 100644
--- a/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
+++ b/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
@@ -69,6 +69,33 @@ public class DefaultForwardFlowTests
         Assert.Null(message.Content);
     }
 
+    [Fact]
+    public void ReplacePlaceholder_ShouldReplaceQueryFromMappingBodyForNoneContentType()
+    {
+        var flow = new TestForwardFlow();
+        var context = new ForwardCoreContext
+        {
+            TargetInterface = new InterfaceDto
+            {
+                ContentType = ContentType.None,
+                RequestAddress = "https://example.com/callback"
+            },
+            OriginalInterfaceMappedInput = new JObject { ["orderId"] = "A001" },
+            QueryFieldList =
+            [
+                new InterfaceFormFieldDto
+                {
+                    Name = "notifyBizEventDTO",
+                    Value = GlobalConst.FromMappingBody
+                }
+            ]
+        };
+
+        flow.ReplacePlaceholder(context);
+
+        Assert.Equal("{\"orderId\":\"A001\"}", Assert.Single(context.QueryFieldList).Value);
+    }
+
     class TestForwardFlow : DefaultForwardFlow
     {
         public void SetContentTypeForTest(ForwardCoreContext context, HttpRequestMessage message)